Abrasion-Erosion Evaluation of Concrete Mixtures for Stilling Basin Repairs, Kinzua Dam, Pennsylvania.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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The resistance to abrasion-erosion of several concretes made with different coarse aggregates, with and without silica fume as a mineral admixture, was evaluated, Testing was done in accordance with the Corps of Engineers standard test method. Initially, concretes made with a limestone coarse aggregate available near the project site and with two gabbros from New York and Virginia were prepared and tested. Although the gabbros were thought to be harder than the limestone, testing revealed very little difference in abrasion-erosion resistance among the three aggregates. The two gabbros did not show a great enough improvement to justify the increased transportation costs necessary for their use. A polymer portland-cement concrete epoxy-modified concrete was also prepared using the limestone aggregate. This material showed very little improvement on abrasion-erosion resistant--certainly not enough improvement to justify the high cost of the epoxy product. High-strength concretes fc 7500 psi made using the limestone aggregate and one of the gabbros and containing silica fume and a high-range water reducing admixture showed improved abrasion resistance. Very high strength silica-fume concretes fc 14,000 psi showed excellent abrasion-erosion resistance. Cores taken from the fiber-reinforced concrete overlay presently in the Kinzua stilling basin were also tested. The cores showed very high abrasion losses, which agrees well with the apparent poor performance of the material in the prototype. Author
- Ceramics, Refractories and Glass
- Civil Engineering